主程序中设置中断向量，调用新中断，并驻存在内存中。中断处理程序调用了系统的时钟，并在正点时启动扬声器进行报时。- In the master routine establishes the severance vector,
transfers the new severance, and in existence memory in. The interrupt
handling routine transferred the system clock, and when on time starts
the speaker to carry on reports time.